[jira] [Created] (ARROW-5349) [Python/C++] Provide a way to specify the file path in parquet ColumnChunkMetaData

["Joris Van den Bossche (JIRA)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-5349:
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             Summary: [Python/C++] Provide a way to specify the file path in parquet ColumnChunkMetaData
                 Key: ARROW-5349
                 URL: https://issues.apache.org/jira/browse/ARROW-5349
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++, Python
            Reporter: Joris Van den Bossche
             Fix For: 0.14.0


After ARROW-5258 / https://github.com/apache/arrow/pull/4236 it is now possible to collect the file metadata while writing different files (then how to write those metadata was not yet addressed -> original issue ARROW-1983).

However, currently, the {{file_path}} information in the ColumnChunkMetaData object is not set. This is, I think, expected / correct for the metadata as included within the single file; but for using the metadata in the combined dataset `_metadata`, it needs a file path set.

So if you want to use this metadata for a partitioned dataset, there needs to be a way to specify this file path. 
Ideas I am thinking of currently: either, we could specify a file path to be used when writing, or expose the `set_file_path` method on the Python side so you can create an updated version of the metadata after collecting it.

cc [~pearu] [~mdurant]



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